Santa Cruz frames are the most desirable out there. Most of the frame options are now carbon, but there are still a few alloy models in the range.
Frames from Santa Cruz include the 5010 their 130mm trail bike, the 150mm travel trail/enduro Bronson and the aggressive 170mm Nomad enduro model. The alloy Heckler is a 150mm trail bike which is excellent value.
Santa Cruz make one DH model, the genre topping V10 downhill bike.